A representative for the 18-year-old teen sweetheart declined to describe the nature of Demi’s issues, but a source close to the Camp Rock star’s family tells People that in the past, she has “fought through eating disorders and has struggled with cutting. … Demi is taking control by getting help.”

According to TMZ, a physical clash with a female member of the tour was the “catalyst” for her rehab trip. Speculation is now rampant that the female in question is her exJoe Jonas’ new girlfriend Ashley Greene, who was photographed in Ecuador with the Jonas Brothers this week. In September, Demi told Celebuzz that she managed to remain friendly with Joe on tour because “you have to, ‘cause you work with him… When you’re hurt, it’s easy to move on, so it was very easy for me to move on.” (A source close to the Lovato family contradicts rumors that Demi clashed with Greene, telling People magazine that the run-in was with a female dancer on the tour.)

Demi was a victim of bullying, an issue many teens are now coming forward to address. As far back as 2009, long before the current trend, Lovato spoke out against bullying in a PSA commercial. Check it out below:

Demi recently told Cambio that she “actually ended up leaving school because of [bullying].”

“I just called my mom and I was crying and I said ‘I don’t want to go to school any more,'” Demi said of her younger years. “It was a rough time, I was by myself.” (A source who’s reportedly “extremely close” to the actress-singer has confirmed to TMZ that bullying is the root cause of Lovato’s stay in rehab.)

The good news, as TMZ reports, is that Demi’s rep confirms she is not receiving treatment for drug use.

Stay with Celebuzz for more updates on Demi’s condition. Our thoughts and good wishes are with Demi during this difficult time. Leave her yours in the comments.